Electrical distribution system.



P. H. THOMAS.

ELECTRICAL DISTRIBUTION SYSTEM. APPLICATION IILED'APR. 9; 1910.

1,091,256. I Pat nted Mar. 24, 1914..

4 ATTORNEY I To all whom it may concern 'Jersey, have invented certain new and useful maintaining current relatively constant in UNITED STATES PATENT OFFICE.

MENTS, TO COOPER HEWITT ELECTRIC CORPORATION OF NEW JERSEY.

'LPERCY H. THoMAsoF MoNToLAm, NEW JERSEY, ASSIGNOR, BY MESNE ASSIGN- COMPANY, or HOBOKEN, NEW JERSEY, A

. ELECTRICAL DISTRIBUTION SYSTEM.

- Specification of Letters Patent.

Patented Mar. 24, 1914.

Original application filed March 5, 1903, Serial No. 146 ,282. Divided and this aaiplication filed April 9, i

1910. Serial Be it known that I, PERCY H. THOMAS, a citizen of the United States, and resident of Montelair, county of Essex, State of New Improvements in Electrical Distribution Systems, of which the following is a specification. I

The present invention makes use of the qualities of the vapor converter combined with one or more magnets for regulating the current in a portionof a system supplied from a source of varying or pulsating currents. The mannerv in which this object is accomplished will be understood by refer-' en'ce to the drawing. In the drawings I illustrate means for the field coils of an electric motor supplied from any suitable source. The .mains extending from the source are shown at l and 2, the field coils at 3, the armature at 4. In a shunt .circuit, 5, around the field coils I include a vapor converter,'6, as shown. By virtue of the natural characteristics of vaport electric apparatus of the sort illustrated, the mercury electrode can not become a positive electrode with respect to the solid electrode unless the initialreluctance at the latter electrode is overcome. Accordingly there will be no danger of a short circuit through the shunt, 5 around the field coils 8 in the natural operation of the device. So long as the current supplied from the mainsv is constant, the vapor converter plays no part in the action of the motor, owing to the fact that it is so'adjusted as not to percants case Serial Number 1%,282,

. New York, and Stateflof New York, this 5th mit the flow of current in the normal direction of flow through the field. lVhen, however the electro-motive-force in the supply circuit decreases, the reactive efiect prd duced in the field coils will have a tendencv to continue thecurrent in-the original direction of 'fiow. which current will find a path through the vapor converter 6.

I have shown my invention as applied to the control of a series motor. The same princ ple might be applied to other types of electric motors as well. The field magnets as shown in the drawing obviouslyserve to steady operation in view of their inductance 'to smooth out and render more nearly uniform the varying current traversing'them.

This application is a division of applifiled 56 March 5, 1903.

I claim as myinvention:

In a system of electrical distribution, the" combination with supply mains, a motor in cluding a series Winding and an armature 'and connections between said-motor and saidmains,of a mercury vapor rectifier comprising an exhausted container and suitable electrodes therein,- permitting the passage, of current in'one direction only, said rectitier connected in shunt to said motor field whereby the discharge of the field traverses the rectifier and the coil itself only.

Signed at New York, in the county of day of April, A. 1910.

PERCY H. THOMASQ Vitnesses I lVM. H. GAPEL, THos. H. BROWN. 

